The Conductance of Auroral Magnetic Field Lines

摘要: Recent results from the Dynamics Explorer satellites have indicated that in auroral zone a linear relationship exists between field-aligned current density and potential drop parallel to magnetic field lines. Evidence for this Ohm's law was found mapping of perpendicular electric fields currents high low altitudes. The depends on wavelength electric-field variations. A scale length formula is determined by ratio line conductance ionospheric Pedersen conductance. conductivity also control at short-wavelength limit no longer important north-south east west altitudes (i.e., above drop). At short limit, takes simple form: integral profile which, according theory, proportional density. Assuming are form infinite sheets orientated east-west, second fieldmore » field.« less